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Considering the CPU where the user-space scheduler is running as busy doesn't really provide any benefit, since the user-space scheduler is constantly dispatching an amount of tasks equal to the amount of idle CPUs and then yields (therefore its own CPU should be considered idle). Considering the CPU where the user-space scheduler is running as busy doesn't provide any benefit, as the scheduler consistently dispatches tasks equal to the number of idle CPUs and then yields (therefore its own CPU should be considered idle). This also allows to reduce the overall user-space scheduler CPU utilization, especially when the system is mostly idle, without introducing any measurable performance regression. Measuring the average CPU utilization of a (mostly) idle system over a time period of 60 sec: - wihout this patch: 5.41% avg cpu util - with this patch: 2.26% avg cpu util Signed-off-by: Andrea Righi <andrea.righi@canonical.com> |
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